CN108226120B - Device and method for measuring size and energy distribution of sheet laser beam - Google Patents
Device and method for measuring size and energy distribution of sheet laser beam Download PDFInfo
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- CN108226120B CN108226120B CN201810065442.2A CN201810065442A CN108226120B CN 108226120 B CN108226120 B CN 108226120B CN 201810065442 A CN201810065442 A CN 201810065442A CN 108226120 B CN108226120 B CN 108226120B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention discloses a device and a method for measuring size and energy distribution of a flaky laser beam, wherein the device comprises a laser, a plano-concave lens, a collimating convex-column lens, a focusing convex-column lens, a dye box, a first optical filter, a second optical filter, a first CCD camera lens, a second CCD camera lens, a first CCD camera and a second CCD camera, the laser output by the laser forms the flaky laser beam through the plano-concave lens, the collimating convex-column lens and the focusing convex-column lens, the flaky laser beam acts on an acetone solution in the dye box to generate excitation fluorescence, the excitation fluorescence enters the first CCD camera through the first optical filter and the first CCD camera lens, and enters the second CCD camera through the second optical filter and the second CCD camera lens. The invention measures the size and energy distribution information of the sheet laser beam by utilizing acetone PLIF, is used for optimizing a sheet light shaping system and correcting test errors caused by laser energy fluctuation, and improves the accuracy of a laser spectrum diagnosis test.
Description
Technical Field
The invention belongs to the technical field of plane laser spectrum diagnosis, and relates to a device and a method for measuring the size and energy distribution of a sheet laser beam.
Background
PLIF (planar Laser Induced Fluorescence) is a Laser spectrum diagnostic technique, and can be applied to diagnosis of concentration fields and temperature fields with high-speed changes. The tunable laser is expanded and collimated into a planar sheet-shaped light beam meeting the requirements through a cylindrical lens with a certain focal length, and when the sheet light passes through a flow field to be diagnosed, the trace particles in the flow field can be selectively excited, so that corresponding electrons in the trace particles are excited to transition from a ground state to an excited state. The electrons in the excited state return from the excited state to the ground state by spontaneous radiation and fluoresce. The method is applied to a plurality of tracers of PLIF, acetone is widely applied, and the acetone serving as the PLIF tracer is suitable for diagnosing a high-speed combustion field and a hypersonic flow field.
The acetone as the tracer has the following main characteristics:
1. has higher saturated vapor pressure at room temperature, and is convenient for adding the tracer.
2. The fluorescence generated after the acetone is excited is blue-violet light (350-550 nm) which is in a visible light wave band, so that the signal acquisition of a CCD camera is facilitated.
3. The fluorescence lifetime of acetone is very short, which is convenient for 'freezing' time in high-speed flow field diagnosis and has very good time resolution.
4. The signal strength is strong, and the signal-to-noise ratio is high.
For space engineering, when the spacecraft completes task return, the spacecraft flies at ultra-high speed in the atmosphere, and the interaction between the spacecraft returning capsule and high-speed airflow in the atmosphere is particularly critical in the whole process. The related aircraft model is placed in the wind tunnel, the distribution of the peripheral flow field of the aircraft model in the hypersonic flow field is analyzed by adopting a PLIF technology, the visualization of the flow field is realized, and various influences of the ultrahigh-speed airflow in the flow field on the aircraft are known, so that the related support can be provided for the further optimization design of the aircraft.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the size and energy distribution of a sheet laser beam, which are used for measuring the size (thickness and parallelism) and energy distribution information of the sheet laser beam by utilizing an acetone Plane Laser Induced Fluorescence (PLIF) technology, optimizing a sheet light shaping system, correcting test errors caused by laser energy fluctuation and improving the accuracy of a laser spectrum diagnosis test.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a measure device of slice laser beam size and energy distribution, includes laser instrument, plano-concave lens, collimation convex column lens, focus convex column lens, dye box, first light filter, second light filter, first CCD camera lens, second CCD camera lens, first CCD camera, second CCD camera, wherein:
the laser, the plano-concave lens, the collimating convex-column lens, the focusing convex-column lens and the dye box are sequentially arranged along the X-axis direction;
the second optical filter, the second CCD camera lens and the second CCD camera are sequentially arranged along the Y-axis direction;
the first optical filter, the first CCD camera lens and the first CCD camera are sequentially arranged along the Z-axis direction;
the focusing convex-column lens, the collimating convex-column lens and the plano-concave lens form a sheet-shaped laser beam shaping system;
a staff gauge is pasted on the dye box;
the first CCD camera is parallel to an X-Y plane;
the second CCD camera is parallel to an X-Z plane;
laser output by the laser is expanded by the plano-concave lens and collimated by the collimating convex-cylindrical lens, and then is focused along the Y-axis direction by the focusing convex-cylindrical lens to form a sheet-shaped laser beam perpendicular to the Y-Z plane, the sheet-shaped laser beam acts on acetone solution in the dye box to generate excited fluorescence, the excited fluorescence enters the first CCD camera through the first optical filter and the first CCD camera lens, and the excited fluorescence enters the second CCD camera through the second optical filter and the second CCD camera lens.
A method for measuring the size and energy distribution information of a sheet-shaped laser beam by using the device comprises the following steps:
injecting an acetone solution with a certain concentration into a dye box, and placing the acetone solution on a transmission path of a sheet laser beam;
shaping the laser into a sheet laser beam through a plano-concave lens, a collimating convex-column lens and a focusing convex-column lens, wherein the sheet laser beam passes through an observation area in the dye box and excites acetone molecules to generate excited fluorescence;
adjusting the position of the dye box, wherein the end face of the sheet laser beam is close to a graduated scale on the upper surface of the dye box, adjusting a first CCD camera and a lens thereof, imaging the graduated scale and the excited fluorescence in the first CCD camera simultaneously, and obtaining the thickness distribution information of the sheet laser beam through the first CCD camera;
and step four, adjusting a second CCD camera and a lens thereof to enable the image plane to coincide with the position of the sheet laser beam, and obtaining the parallelism and energy distribution information of the sheet laser beam through the second CCD camera.
The invention has the following advantages:
1. the invention aims to improve the signal-to-noise ratio and the accuracy of flow field diagnosis, focuses on measuring the size and the energy distribution information of the sheet laser beam, optimizes and adjusts the beam shaping system based on the size and the energy distribution information to obtain high-quality sheet laser and corrects errors caused by uneven laser energy distribution.
2. The method is suitable for the field of flow field plane laser-induced fluorescence diagnosis with acetone as a tracer, and can be used for obtaining the size of the sheet laser beam and the laser energy distribution information of a trial area.
3. The invention improves the adjustment precision of the sheet laser in laser spectrum diagnosis, and improves the precision to 10 mu m magnitude compared with the traditional method that human eyes observe the thickness of the sheet and judge whether the sheet is parallel light.
4. The invention can be arranged in a test light path, can record the energy distribution information of the sheet laser beam in real time under the condition of not interfering the test process, and can eliminate test errors or errors caused by uneven energy distribution by an energy distribution normalization means.
Drawings
FIG. 1 is a schematic diagram of the structure of the device for measuring the size and energy distribution of a sheet-like laser beam according to the present invention;
FIG. 2 is a measurement diagram of a simulation experiment of a first CCD camera;
fig. 3 is a diagram of the measurement of the experiment to be photographed by the second CCD camera.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The first embodiment is as follows: the present embodiment provides a device for measuring size and energy distribution of a sheet-shaped laser beam, as shown in fig. 1, the device is composed of a laser 1, a plano-concave lens 2, a collimating convex-cylindrical lens 3, a focusing convex-cylindrical lens 4, a dye box 8, a first optical filter 10, a second optical filter 7, a first CCD camera lens 10, a second CCD camera lens 6, a first CCD camera 12, and a second CCD camera 5, wherein:
the laser 1, the plano-concave lens 2, the collimating convex-column lens 3, the focusing convex-column lens 4 and the dye box 8 are sequentially arranged along the X-axis direction;
the second optical filter 7, the second CCD camera lens 6 and the second CCD camera 5 are sequentially arranged along the Y-axis direction;
the first optical filter 10, the first CCD camera lens 11 and the first CCD camera 12 are sequentially arranged along the Z-axis direction;
the focusing convex-column lens 4, the collimating convex-column lens 3 and the plano-concave lens 2 form a sheet-shaped laser beam shaping system;
a staff gauge is pasted on the dye box 8;
the first CCD camera 12 is parallel to the X-Y plane;
the second CCD camera 5 is parallel to the X-Z plane;
laser output by the laser 1 is expanded by the plano-concave lens 2 and collimated by the collimating convex-cylindrical lens 3 and then focused by the focusing convex-cylindrical lens 4 along the Y-axis direction to form a sheet-shaped laser beam perpendicular to the Y-Z plane, the sheet-shaped laser beam acts on acetone solution with a certain concentration in the dye box 8 to generate excitation fluorescence, the excitation fluorescence enters the first CCD camera 12 through the first optical filter 10 and the first CCD camera lens 11, the fluorescence image measured by the first CCD camera 12 can calculate thickness information of the sheet-shaped laser beam, the excitation fluorescence enters the second CCD camera 5 through the second optical filter 7 and the second CCD camera lens 6, and the fluorescence image measured by the second CCD camera 5 can calculate parallelism and energy distribution information of the sheet-shaped laser beam.
In this embodiment, the dye box 8 is made of quartz, and the 266nm laser transmittance is greater than 98%.
In this embodiment, the size of the sheet-like laser beam is smaller than the size of the viewable side of the cartridge 8.
In this embodiment, the first optical filter 10 and the second optical filter 7 are band-pass filters, and the passband range is greater than or equal to 300nm and less than or equal to 500nm, so that noise caused by laser scattering can be effectively prevented.
In this embodiment, the pixels of the first CCD camera 12 and the second CCD camera 5 are not less than 2048 × 2048, and the spatial resolution accuracy in the observation area can reach 10 μm level.
In this embodiment, the timing control accuracy of the laser output time and the exposure time of the first CCD camera 12 and the second CCD camera 5 is 5ps, and the shortest exposure time of the first CCD camera 12 and the second CCD camera 5 is 100 ns.
The second embodiment is as follows: the embodiment provides a method for measuring the size (thickness and parallelism) and the energy distribution of a sheet-shaped laser beam by using the device in the first embodiment, and the method comprises the following steps:
step one, filling the dye box 8 with acetone solution with certain concentration and fully mixing, and placing the dye box 8 in a light path;
secondly, after passing through a sheet-shaped laser beam shaping system, the sheet-shaped laser beam passes through an observation area of the dye box 8 to excite the acetone tracer molecules to generate excitation fluorescence;
adjusting the position of the dye box 8 to enable the end face of the sheet-shaped laser beam to approach a graduated scale on the upper surface of the dye box 8, adjusting the position of the first CCD camera 12 and a lens of the first CCD camera 12, and acquiring thickness distribution information of the sheet-shaped laser beam through the first CCD camera 12, wherein a thickness information image of the sheet-shaped laser beam shot by the first CCD camera 12 is shown in FIG. 2;
and step four, adjusting the position of the second CCD camera 5 and a lens thereof to enable the image plane to coincide with the position of the sheet laser beam, obtaining the parallelism and energy distribution information of the sheet laser beam through the second CCD camera 5 according to the fluorescence intensity distribution, and obtaining a sheet laser beam parallelism information image shot by the second CCD camera 5 as shown in FIG. 3.
Claims (8)
1. The utility model provides a measure device of slice laser beam size and energy distribution which characterized in that the device comprises laser instrument, plano-concave lens, collimation convex column lens, focus convex column lens, dye box, first light filter, second light filter, first CCD camera lens, second CCD camera lens, first CCD camera, second CCD camera, wherein:
the laser, the plano-concave lens, the collimating convex-column lens, the focusing convex-column lens and the dye box are sequentially arranged along the X-axis direction;
the second optical filter, the second CCD camera lens and the second CCD camera are sequentially arranged along the Y-axis direction;
the first optical filter, the first CCD camera lens and the first CCD camera are sequentially arranged along the Z-axis direction;
the focusing convex-column lens, the collimating convex-column lens and the plano-concave lens form a sheet-shaped laser beam shaping system;
a staff gauge is pasted on the dye box;
the first CCD camera is parallel to an X-Y plane;
the second CCD camera is parallel to an X-Z plane;
laser output by the laser is expanded by the plano-concave lens and collimated by the collimating convex-cylindrical lens, and then is focused along the Y-axis direction by the focusing convex-cylindrical lens to form a sheet-shaped laser beam perpendicular to the Y-Z plane, the sheet-shaped laser beam acts on acetone solution in the dye box to generate excited fluorescence, the excited fluorescence enters the first CCD camera through the first optical filter and the first CCD camera lens, and the excited fluorescence enters the second CCD camera through the second optical filter and the second CCD camera lens.
2. The apparatus as claimed in claim 1, wherein the dye cell is made of quartz, and the 266nm laser transmittance is greater than 98%.
3. The apparatus for measuring a size and an energy distribution of a sheet laser beam according to claim 1 or 2, wherein the size of the sheet laser beam is smaller than a size of an observable facet of the cartridge.
4. The device for measuring the size and energy distribution of a sheet-like laser beam according to claim 1, wherein the first and second filters are band-pass filters, and the pass band range is 300nm or more and 500nm or less.
5. The apparatus of claim 1, wherein the pixels of the first and second CCD cameras are no lower than 2048 x 2048.
6. The apparatus according to claim 1, wherein the timing control accuracy of the laser output time and the exposure time of the first and second CCD cameras is 5 ps.
7. The apparatus for measuring a size and energy distribution of a sheet laser beam according to claim 1 or 5, wherein the first CCD camera and the second CCD camera have a shortest exposure time of 100 ns.
8. A method for measuring information on size and energy distribution of a sheet-like laser beam using the apparatus of any one of claims 1 to 7, characterized by the steps of:
injecting an acetone solution with a certain concentration into a dye box, and placing the acetone solution on a transmission path of a sheet laser beam;
shaping the laser into a sheet laser beam through a plano-concave lens, a collimating convex-column lens and a focusing convex-column lens, wherein the sheet laser beam passes through an observation area in the dye box and excites acetone molecules to generate excited fluorescence;
adjusting the position of the dye box, wherein the end face of the sheet laser beam is close to a graduated scale on the upper surface of the dye box, adjusting a first CCD camera and a lens thereof, imaging the graduated scale and the excited fluorescence in the first CCD camera simultaneously, and obtaining the thickness distribution information of the sheet laser beam through the first CCD camera;
and step four, adjusting a second CCD camera and a lens thereof to enable the image plane to coincide with the position of the sheet laser beam, and obtaining the parallelism and energy distribution information of the sheet laser beam through the second CCD camera.
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| CN109239930A (en) * | 2018-10-10 | 2019-01-18 | 哈尔滨工业大学 | A kind of saturation type laser sheet beam apparatus for shaping |
| CN110751047B (en) | 2019-09-20 | 2021-08-31 | 维沃移动通信有限公司 | Fingerprint identification module and electronic equipment |
| CN110907420B (en) * | 2019-12-04 | 2021-07-02 | 中国科学院过程工程研究所 | Device for measuring mass transfer equilibrium time between immiscible solution and liquid phase and measuring method using device |
| CN112558313A (en) * | 2020-12-25 | 2021-03-26 | 哈尔滨工业大学 | Curved surface conformal light beam generating device for measuring PLIF flow field on surface of aircraft |
| CN113310968B (en) * | 2021-04-22 | 2022-07-08 | 清华大学 | Method for improving repeatability of laser-induced breakdown spectroscopy based on beam shaping |
| CN113419352A (en) * | 2021-08-23 | 2021-09-21 | 拓米(成都)应用技术研究院有限公司 | Optical mechanism for Gaussian beam shaping, laser cutting system and process |
| CN115639124B (en) * | 2022-11-16 | 2023-07-28 | 哈尔滨工业大学 | Device and method for realizing soot concentration measurement and in-situ calibration by single-wavelength laser |
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| JP4407927B2 (en) * | 2004-08-10 | 2010-02-03 | 正司 香月 | Vapor concentration measurement method |
| DE102007045897A1 (en) * | 2007-09-26 | 2009-04-09 | Carl Zeiss Microimaging Gmbh | Method for the microscopic three-dimensional imaging of a sample |
| CN104931224B (en) * | 2015-06-16 | 2017-06-16 | 哈尔滨工业大学 | A kind of device and method for observing different vacuum environment downstream flow field structures |
| US11320640B2 (en) * | 2016-06-24 | 2022-05-03 | Howard Hughes Medical Institute | Automated adjustment of light sheet geometry in a microscope |
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